// Copyright 2012,2013 Vaughn Vernon
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.saasovation.common.port.adapter.notification;
import java.util.ArrayList;
import java.util.List;
import com.saasovation.common.domain.model.DomainEvent;
import com.saasovation.common.event.EventStore;
import com.saasovation.common.event.StoredEvent;
import com.saasovation.common.notification.Notification;
import com.saasovation.common.notification.NotificationPublisher;
import com.saasovation.common.notification.NotificationSerializer;
import com.saasovation.common.notification.PublishedNotificationTracker;
import com.saasovation.common.notification.PublishedNotificationTrackerStore;
import com.saasovation.common.port.adapter.messaging.slothmq.ExchangePublisher;
public class SlothMQNotificationPublisher implements NotificationPublisher {
private EventStore eventStore;
private String exchangeName;
private ExchangePublisher exchangePublisher;
private PublishedNotificationTrackerStore publishedNotificationTrackerStore;
public SlothMQNotificationPublisher(
EventStore anEventStore,
PublishedNotificationTrackerStore aPublishedNotificationTrackerStore,
Object aMessagingLocator) {
super();
this.setEventStore(anEventStore);
this.setExchangeName((String) aMessagingLocator);
this.setExchangePublisher(new ExchangePublisher(this.exchangeName()));
this.setPublishedNotificationTrackerStore(aPublishedNotificationTrackerStore);
}
@Override
public void publishNotifications() {
PublishedNotificationTracker publishedNotificationTracker =
this.publishedNotificationTrackerStore().publishedNotificationTracker();
List<Notification> notifications =
this.listUnpublishedNotifications(
publishedNotificationTracker.mostRecentPublishedNotificationId());
try {
for (Notification notification : notifications) {
this.publish(notification);
}
this.publishedNotificationTrackerStore()
.trackMostRecentPublishedNotification(
publishedNotificationTracker,
notifications);
} catch (Exception e) {
System.out.println("SLOTH: NotificationPublisher problem: " + e.getMessage());
}
}
@Override
public boolean internalOnlyTestConfirmation() {
throw new UnsupportedOperationException("Not supported by production implementation.");
}
private EventStore eventStore() {
return this.eventStore;
}
private void setEventStore(EventStore anEventStore) {
this.eventStore = anEventStore;
}
private String exchangeName() {
return this.exchangeName;
}
private void setExchangeName(String anExchangeName) {
this.exchangeName = anExchangeName;
}
private ExchangePublisher exchangePublisher() {
return exchangePublisher;
}
private void setExchangePublisher(ExchangePublisher anExchangePublisher) {
this.exchangePublisher = anExchangePublisher;
}
private List<Notification> listUnpublishedNotifications(
long aMostRecentPublishedMessageId) {
List<StoredEvent> storedEvents =
this.eventStore().allStoredEventsSince(aMostRecentPublishedMessageId);
List<Notification> notifications =
this.notificationsFrom(storedEvents);
return notifications;
}
private List<Notification> notificationsFrom(List<StoredEvent> aStoredEvents) {
List<Notification> notifications =
new ArrayList<Notification>(aStoredEvents.size());
for (StoredEvent storedEvent : aStoredEvents) {
DomainEvent domainEvent = storedEvent.toDomainEvent();
Notification notification =
new Notification(storedEvent.eventId(), domainEvent);
notifications.add(notification);
}
return notifications;
}
private void publish(Notification aNotification) {
String notification =
NotificationSerializer
.instance()
.serialize(aNotification);
this.exchangePublisher().publish(aNotification.typeName(), notification);
}
private PublishedNotificationTrackerStore publishedNotificationTrackerStore() {
return publishedNotificationTrackerStore;
}
private void setPublishedNotificationTrackerStore(PublishedNotificationTrackerStore publishedNotificationTrackerStore) {
this.publishedNotificationTrackerStore = publishedNotificationTrackerStore;
}
}